In my experience there is hope for those of us with tinnitus. Following a mild heart attack in 2011 I developed tinnitus. The Audiologist I saw said that the basic cause was mild hearing loss and that in his experience, although not clinically proven, a stressful episode will trigger the onset of the disease symptoms (constant loud ringing).
Over the last couple of years the ringing has abated maybe 70-80%. From painful screeching to a hardly noticeable mild drone. Even fairly loud listening sessions or a night at the local dirt track watching USAC racing don't trigger the extreme ringing anymore. I did switch to decaf a couple of years back and maybe that's part of it. But, I really think that time just lessened the symptoms. Maybe it will for everyone else.
Jim S.